I model airplanes in 1/32 scale.
I prefer tanks, military vehicles, fire fighting apparatus (thats a fancy way of saying fire engines and fire trucks), heavy earth moving and construction equipment and G gauge model trains in 1/24 and 1/25 scale.
I haven't done much with ships in a long while.
When I was young I worked in 1/72 scale.
In my middle ages I built models in 1/48 to 1/50 scale.
Now I've retired and I'm in 1/24 and 1/25 scale, except for airplanes which I'll stay with in 1/32.
Any material: plastic (injection, vacufrom, resin), wood (solid, stick and tissue), metal, paper card, whatever.
I am not enamored with the idea of putting every detail possible into a model.
Trying to get every detail into a model drive me out of HO gauge model railroading when I entered college.
I am a sculptor and a lot of my models end up as part of my art work.
Yes, I have a very large stash of unbuilt models known as my "attic insulation".
But I no longer keep them in the attic as an attic fire a few years ago melted a number of them.
They are only toys. No great loss. Easily replaced with the liberal dispensation of money. This is a hobby to me, an amusement, a past-time; Something I do for relaxation and enjoyment.
I have more fun modifying kits and models than in just building them as intended. For example, there really existed things like Hurrischmitts and Spitschmitts. Also, there were many experiments with adding floats to various airplanes. Those are fun to model.